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Camshaft Basics Example Cam Card

Camshaft Basics Example Cam Card
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Example Cam Card
Check out the intake duration alongside the exhaust duration, depicted in the same manner as the intake. Remember, the engine turns two revolutions (720 degrees) for a complete cycle of events to take place. By melding the intake and exhaust duration arcs together, we form the valve opening event diagram at the bottom. In this example, the intake opens (IO) 25 degrees before TDC and closes 55 after. The exhaust opens (EO) 55 degrees before BDC and closes 25 after TDC. The way we would quote the events of this cam are 25-55-55-25. The overlap, that's when both the intake and exhaust are open, is indicated here, and in this case is 50 degrees (25+25). 
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